. Cut and drag the sonar will make a relatively unique sound, and experienced sonar soldiers can tell it with their ears.

Meng Guangyang's experience is not as long as the sonar of the North Carolina, but it is much better than a novice. He immediately issued an alarm when he found that the North Carolina suddenly cut off the drag sonar.

Zhou Yusheng was shocked, and the other officers and soldiers became nervous.

Unlike the previous tactical decision-making, Zhou Yusheng did not make a decision immediately and did not rush to issue orders.

The Shark is still hovering not far from the west of the Troy Seabed peak, and the North Carolina is about five nautical miles south. The Sand Fish is not on the North Carolina route, so there is no need to worry about the abandoned towing sonar hit. Because the average density of the towing sonar is slightly lower than the sea water density, it will not sink after leaving the submarine, but will slowly float up. It will not sink until it is distanced from the submarine and the self-destruct device on the towing sonar is activated, so as not to float to the sea and be salvaged by the enemy.

Before making tactical decisions, Zhou Yusheng must think clearly about one question: What exactly does the US military captain want to do?

Only in extreme cases will the submarine captain order the costly drag sonar to be abandoned.

During combat operations, submarines are often subject to sudden attacks during normal navigation, and need to accelerate or make sharp turns before they do so.

The Shark did not launch an attack, nor did it even use the attack sonar.

Why did the North Carolina abandon the drag sonar?

There is only one reasonable explanation: the US captain noticed the threat behind him and was ready to make the submarine accelerate and make a sharp turn, and strive to take the initiative.

Then, the North Carolina will accelerate its steering next!

If the Shark happens to be behind the North Carolina, Zhou Yusheng doesn't have to worry about anything. When the North Carolina has thrown away the drag sonar, the Shark can accelerate in advance and shorten the distance. Then, stop urgently when the North Carolina turns sharply, and continue to stay in the sonar blind spot of the North Carolina, making all the efforts of the US captain in vain.

Unfortunately, the Shark is not behind the North Carolina, but to its left.

Now let alone acceleration, even if you sail slowly, you may be discovered by the North Carolina.

It seemed that Zhou Yusheng was a little hesitant, but in fact, he had already made the decision.

At this time, keeping quiet is the best choice.

No matter what the Americans want to do, Zhou Yusheng can only take corresponding tactical actions after the North Carolina changes its route.

"Captain, the target starts to accelerate."

Zhou Yusheng thought for a while and asked Meng Guangyang: "Speed ​​up quickly?"

Sonar nodded long and said, "It's very fast, and it's expected to exceed thirty quarters after the three-point spell."

"Continue to pay attention to the target situation." Zhou Yusheng still did not rush to issue an order.

Mu Haoyang looked at the captain with a serious expression and asked Yang Yuanfan who was standing next to him, "Why don't you catch up?"

"It's not the time." Yang Yuanfan smiled.

"What does it mean?" Mu Haoyang still couldn't understand.

"Submarines are not cars, nor are they aircraft. Under normal circumstances, it is very good to increase their speed to thirty knots within five minutes. Rapid acceleration is only part of the tactical avoidance action. During combat, this can only be done when attacked from behind." Yang Yuanfan paused for a moment and said, "The speed of the submarine is far less than that of the torpedo, so if you want to avoid torpedoes, you must perform more intense tactical maneuvers, such as sharp turns, emergency float, and then release torpedo jamming bombs."

"The problem is, we didn't launch torpedoes."

"The 'North Carolina' is not avoiding torpedoes, but turning the situation around." Yang Yuanfan sighed and said, "The Americans must have discovered us, so they will make a sharp turn after a sharp acceleration, and try to go around behind us and occupy a favorable attack position."

"Or I want us to speed up in a hurry." Li Xiaoming glanced at Yang Yuanfan and said to Mu Haoyang, "If the 'North Carolina' does not find us, but just suspects that we are following behind, it will accelerate the sailing, distance from us, and force us to speed up the sailing as well. At that time, it will take another sharp turn and aim the sidewalk at us before we stop and intercept the noise we make."

Yang Yuanfan smiled and said, "There is also a possibility."

"Then what should we do?"

"Stay here and do nothing until the North Carolina starts turning."

Zhou Yusheng did not do anything, because doing anything at this time may expose the whereabouts of the "Shark".

In less than three minutes, the North Carolina's speed reached 30 knots, and then, as Yang Yuanfan predicted, turned urgently about ten nautical miles to the right of the Shark. Because it was only about one nautical mile from the Troy seabed peak, the North Carolina could only turn to the right.

Because it was an emergency turn, it took only about fifteen seconds to change the course of the North Carolina by ninety degrees.

By this time, Zhou Yusheng was still unmoved.

This time, Mu Haoyang did not raise any questions, because through the previous tactical maneuvers, he already knew that only by distance from the North Carolina could the Shark enter its sonar blind spot.

Zhou Yu was so angry that Ramons couldn't sit still.

When turning, the North Carolina used three sonar arrays on the starboard side to focus on the western waters, but found nothing.

In order to enhance the detection effect of passive sonar, after completing the steering, Ramons also stopped the propulsion system urgently and glided for half a minute by relying on inertia. When the thruster was running again, the speed of the North Carolina dropped to twenty knots, and the spoiler noise generated by the hull was greatly reduced.

Even so, no abnormal noise was found on the side sonar array.

Now, Ramons was confused.

Is it his judgment wrong or the computer wrong?

If the "unidentified" submarine did not stay near the Troy Underwater Peak, the North Carolina would not gain anything. If there was a problem with the computer, the "unidentified" submarine did not sink southwest of the Troy Underwater Peak, but was hidden elsewhere and no abnormalities would be found.

Ramons is more willing to trust his experience and intuition than a bunch of high-tech things made up of logic circuits.

There must be something wrong with the computer, and the "unidentified" submarine is nearby.

Thinking of this, Ramons regretted it a little because when the rapid acceleration was accelerated, the huge noise from the North Carolina could be heard dozens of nautical miles away.

The side sonar array did not find any abnormal noise. It was not that the "unidentified" submarine was not nearby, but was waiting for an opportunity. Only when the "North Carolina" headed stabilized will the "unidentified" submarine emerge from the lurking location and approached quietly from the rear of the "North Carolina".

As long as the North Carolina is still turning and maneuvering at high speed, the "unidentified" submarine will not act rashly.

In other words, as long as you maintain a high speed and keep turning, the North Carolina will not be attacked and can even leave the attack range of the "unidentified" submarine.

The problem is that in this way, the North Carolina cannot detect an "unidentified" submarine with passive sonar.

Failure to use passive sonar is equivalent to losing one ear.

To find an "unidentified" submarine, you can only use active sonar, and actively attack the sonar.

The performance of bqq-10 is very advanced. Ramons is confident that he can use active sonar to find "unidentified" submarines, but he must consider a problem.

Will the use of attacking sonar cause the "unidentified" submarine to launch a counterattack?

If the "unidentified" submarine feels threatened and launches an attack on the grounds, Ramons will have to do everything possible to create favorable conditions before this.

First, you have to distance yourself and get enough counterattack time. Then you have to reach a more favorable submarine depth for the North Carolina, creating conditions for maneuvering. Finally, you have to send a signal to ask for help, so that those dull anti-submarine patrol aircraft can come as soon as possible.

After thinking about it, Ramons did not hesitate anymore.

The North Carolina did not turn immediately, nor float immediately, nor was it in a hurry to throw out the communication float, but accelerated to thirty knots again and continued to sail south.

About fifteen minutes later, the North Carolina suddenly turned.

At the same time as steering, there is also floating up and communication floats. Because of the early preparation, after completing the steering, the bqq-10 spherical attack sonar on the head of the North Carolina began to work, sending high-energy infrasound waves that were enough to evaporate the surrounding sea water.

On the Shark, Meng Guangyang first heard the spoiler sound when the North Carolina turned.

Just a few seconds later, he heard the sound of the projectile object.

Because the North Carolina was not attacked by torpedoes and it was impossible to launch a torpedo jamming bomb, the one that was projected must be a communication buoy.

"You heard it right?"

"It's absolutely right to hear it. The target must have thrown something, and the sound of the cavitation is very clear."

Zhou Yusheng frowned and looked very solemn.

"The 'North Carolina' is definitely calling for reinforcements, and the US anti-submarine patrol aircraft will come soon, we..."

Before Yang Yuanfan finished speaking, the "Shark" vibrated violently.

"Low-frequency active sonar, energy intensity c-level!" On the display screen of the sonar console, the curve indicating the noise signal suddenly jumped up, forming a very obvious peak. Meng Guangyang looked back at Zhou Yusheng and said, "From the target boat, we are in the side lobe of the sound wave."

"Not aimed at us?"

Meng Guangyang nodded and said, "Attach the Troy Mountain Peak."

"Prepare for combat and input attack parameters for torpedoes." Zhou Yusheng stood up and said quickly, "The thruster starts, advances to eight, heads to one eighty, and maintains diving depth."

Heading towards the North Carolina?

Mu Haoyang was startled. Seeing Yang Yuanfan's nervous look, he resisted not asking.

It is a blessing or not a disaster, it is a disaster that cannot be avoided. What should come or come.
Chapter completed!